Protective bridge for window sills

ABSTRACT

The reinforcing bridge is intended to prevent crumbling of plaster at the lateral ledges of window sills under the influence of vibrations, wind and thermal expansions. The reinforcing bridge has a piece of elastic, plastic profile, which serves to embrace one of the lateral cover strips (30.2) of the window sill (30). After the reinforcing bridge (1) is mounted on the cover strip (30.2) of the window sill (30), reinforcing pins (40, 42) are seated in the profile and protrude into the space, which is to be occupied by the plaster (26, 28) of the window jamb and the facade. First, the window sill (30) with its cover strips (30.2) is mounted, a reinforcing bridge (1) is then attached on both sides of the cover strips (30.2) and finally the plaster (26, 28) is applied on the window jamb and the facade.

The invention relates to a protective bridge for the lateral endportions of window sills.

At their left and right edges, window sills usually have upright,lateral end portions. The plaster of the window soffitt normally extendsas far as this end portion. Under the influence of vibrations, such asfrom construction work, street traffic or wind, thermal expansions andthe expansion and contraction of the wood of the window frame, cracksarise in the plaster. After some time, the plaster crumbles above andoutside of the end portions.

This crumbling is to be prevented by the present invention.

This objective is accomplished by the invention in accordance withfollowing description.

After the installation of the window sill with its two end portions, aprotective bridge, which embraces this end portion elastically like aclamp, is mounted on the outside of each end portion. In the protectivebridge, fastening pins are provided, which are a type of nail withtransverse ribs and protrude upwards and outwards after theinstallation. The plaster of the window soffitt and of the facade isthen applied, the fastening pins also being enclosed. The protectivebridge is then firmly seated in the plaster, but remains movable in itslongitudinal direction, that is, at right angles to the plane of thewindow frame. Owing to the fact that the protective bridge embraces theend portion elastically, a certain movement at right angles to the endportion, upwards, downwards and also sideways is possible. In the eventof vibrations, thermal expansions, etc., the protective bride can thusmove relative to the end portion that is embraced by it, so that theplaster is spared and does not develop any cracks or crumble away.

FURTHER DEVELOPMENTS OF THE INVENTION

In cross section, the protective bridge can have the basic shape of a T.The vertical leg and the leg of the T pointing against the window silltogether can form an elastic clamp for embracing the lateral endportion. Relative motions between the protective bridge and the lateralend portion are made possible in this manner.

Preferably, the fastening pins can be mounted in an upright position inan upper leg of the T-shaped profile, which later on protrudes into theplaster of the window soffitt and the facade, and, moreover, in alongitudinal row of the profile, while fastening pins, which protrudeonly from the external end of the vertical leg in a horizontal directioninto the space that is to be occupied by the facade plaster, can beprovided at the vertical leg.

So that the protective bridge can be introduced more readily after thewindow sill and the lateral end portions are installed, the vertical legcan have a cutout into its back region. A sloping edge of this cut outcan start at the lower edge of the leg and extend upwards at the rearand go over into an edge, which extends in the longitudinal direction ofthe profile.

Embodiments with further characteristics of the invention are describedin the following by means of the drawings, in which

FIG. 1 shows a side view of a protective bridge, for the, as seen fromthe outside, right end of the window sill,

FIG. 2 shows a cross section in the II--II plane of FIG. 1,

FIG. 3 shows a plan view of the protective bridge of FIGS. 1 and 2 and

FIG. 4 shows the, as seen from the outside, right lower corner of awindow frame with the adjacent parts of the wall of the house, viewed,however, in the direction of the somewhat downwards sloping window sill,which is shown partially in plan view and partially in section.

As shown by FIGS. 1 to 3, the protective bridge consists of a piece ofelastic plastic with a T-shaped profile. The protective bridge is shownin its use position, in the manner in which it embraces the, as viewedfrom the outside, right lateral end portion 30.2 of a window sill 30.The cross sectional shape of the end portion 30.2 is shown in FIG. 4, asseen from the outside. Basically, it is U-shaped. On the whole, theprotective bridge 1 has a T-shaped cross section. The protective bridgehas a, here as in the following always related to the installedposition, horizontal leg 4, which is flat and form at its left edge aU-shaped claw 6. The protective bridge furthermore has a vertical leg 8,the main section of which is offset somewhat to the right, by about thethickness of the material of the protective bridge. At its lower edge,the vertical leg has an end section 10, which, protruding to the leftand fitting the cross sectional shape of the lateral end portion 30.2,also is constructed in the shape of a claw and runs out to a pointededge.

The first section 5 with its U-shaped claw and the end section 10,together with the vertical leg 8, form a clamp 12, which serves toembrace the lateral end portion 30.2 elastically.

In its longitudinal direction, the second section 7 has a row of holes14, which serve to accommodate the fastening pins 40. Two holes 16, oneof which is above the other, are provided for the same purpose near theleft edge of the vertical leg 8.

In its backwards, lower half, the protective bridge 1 has a cutout 18(FIG. 1), which is edged by an edge 20, which is parallel to itslongitudinal direction, and by a sloping edge 22.

FIG. 4 shows the, viewed from the outside, right lower corner of awindow frame 24 and, next to it on the right, the plaster 26 of thewindow soffitt, which goes over into the plaster 28 of the facade. Atthe lower end of the window frame 24, there is the window sill 30, fromwhich the rear section 30.1, which is bent upwards and fastened to thewindow sill, as well as the outer section 30.3, which in the drawing isthe front section that protrudes downwards, can be recognized. Theviewing direction is in the main plane of the window sill, so thatnothing can be recognized of its main part 30.5, with the exception of aportion at the right, which is shown in section. The right lateral endportion 30.2 of the window sill 30, which is constructed as anapproximately U-shaped profile, can be recognized.

Furthermore, the protective bridge 1, the details of which are shown inFIG. 2, can be recognized. It embraces the lateral end portion 30.2 inclamp-like fashion. A row of fastening pins 40 is inserted through thesecond (right) section 7 of the protective bridge and, moreover, in sucha manner, that the pins project upwards. Two fastening pins 42, oneabove the other, which protrude to the right, are inserted through theholes 16 of the front section of the reinforcing bridge (compare FIG.1).

During the installation, the window frame 24 is installed first in thewell-known manner. The window sill 30 is attached with its rearwardssection 30.1 to the window frame 24 in a manner that is not shown, forexample, with bolts. Before the plaster is applied, the protectivebridge, which is provided with fastening pins 40 and 42, is then pushedbetween the wall or its thermal insulation 44 on the one hand and thelateral end portion 30.2 of the window sill on the other in thedirection of this lateral end portion and finally snapped elasticallyover it. The fastening pins 40 now point upwards in an initially freespace and, moreover, over the whole depth of the window sill, while thefastening pins 42 protrude only forwards, that is, at the outside into aspace, which is to accommodate plaster from the window soffitt and thefacade. Finally, the plaster is applied, the protective bridge beingheld fast by its pins. The second, that is external section 7 of theprotective bridge is also plastered.

REFERENCE SYMBOLS

1--reinforcing bridge

4--horizontal leg

5--first section

6--U-shaped claw

7--second section

8--perpendicular leg

10--end section

12--clamp

14--hole

16--hole

18--cutout

20--edge

22--sloping edge

24--window frame

26--plaster of the window jamb

28--facade plaster

30--window sill

30.1--rearward section

30.2--cover strip

30.3--outer section

30.5--main part

40--reinforcing pin

42--reinforcing pin

44--thermal insulation

I claim:
 1. A protective bridge for a window sill having lateral endportions 30.2 and securing elastically the lateral end portions 30.2 ofthe window sill into a window opening, said bridge comprising:a plasticmember embracing one of said lateral end portions; spaces formed betweenthe sill and the window opening; fastening means extending into spacesformed between the sill and the window opening for fastening said bridgewhen said spaces are filled with plaster; said plastic member beingarranged and constructed to absorb elastically motions of said windowsill thereby preventing cracking of said plaster.
 2. The protectivebridge of claim 1 wherein said plastic member has a T-shaped profiledefined by a vertical leg and a horizontal leg with a first horizontaland a second horizontal section, said vertical leg and said firsthorizontal section forming an elastic clamp for embracing said onelateral end portion, with said second horizontal section protruding intosaid spaces.
 3. The protective bridge of claim 2 wherein said fasteningmeans include first fastening pins inserted into and extending upwardlyfrom said second horizontal section into said spaces.
 4. The protectivebridge of claim 2 wherein said fastening means includes second fasteningpins inserted into and extending horizontally from said vertical leginto said spaces.
 5. The protective bridge of claim 2 wherein saidvertical leg is formed with a rearward lower region having a cutout ofabout half the height and length of said vertical leg.
 6. The protectivebridge of claim 5 wherein said cutout has a sloping edge starting from alower edge of said vertical leg, and a straight edge parallel to saidlower edge.